GB196709A - New or improved portable apparatus for projecting pictures, advertisements and the like upon a screen - Google Patents

Abstract

196,709. Rutledge, A. H. Feb. 2, 1922. Transparencies and like elements, travelling.- Optical-projection apparatus in which a number of carriers for advertisements &c. are fed one at a time to the display portion and afterwards moved along a definite path until they are again displayed is provided with an upper inclined track 29 down which the slide carriers 27 move by gravity to the display position 16. After projection the carriers 27 are released and drop on to a lower track 30 along which they pass to the endless chain 33, by which they are lifted to the upper inclined track 29. The light 19 and the condenser 20 are adjustably supported on a rod 18 secured to the ends of the casing 10. The carriers 27 are fitted at their upper ends with rollers 28 to engage the tracks 29, 30, consisting of spaced wires or rods. A motor 41 drives the endless chain 33 through gearing which also serves to operate the lever 48 through links 57, 60 from a pin attached to one of the gear wheels to release a single carrier from the upper guide to fall into the display position where it is held by pivoted side brackets 52<a> which engage the rollers 28. The reciprocation of the link 54 in a manner similar to that of the link 60 permits the slide to drop on to the lower track 30 and to pass under the action of gravity to the other end of this track where it is engaged by the endless chain 33. The gearing is such that one carrier 27 is raised to the upper track whenever a carrier is released under the action of the links 54, 60.